Xiaomi Mi Mix 3 (128GB/6GB) vs Samsung Galaxy S21 FE (SM-G990U 128GB)

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Side by side comparison between Xiaomi Mi Mix 3 vs Samsung Galaxy S21 FE phones, differences, pros, cons and full specifications. What's the better?

1/20/2022 6:10 PM, updated: 5/19/2025 11:24 AM

Compare Samsung Galaxy S21 FE X Xiaomi Mi Mix 3 (128GB/6GB) 03Points

Specifications Compare Models Pictures

6.39"
AMOLED

1080x2340

12
MP

24mp

6GB
RAM

Octa-core

3200
mAh

(Non removable)

26Points Samsung Galaxy S21 FE (SM-G990U 128GB) Compare Xiaomi Mi Mix 3 X

Specifications Compare Models Pictures

6.4"
AMOLED

1080x2400

12.2
MP

32mp

6GB
RAM

Octa-core

4500
mAh

(Non removable)

What's the better phone? Samsung Galaxy S21 FE (SM-G990U 128GB)

The phonemore's choice is much more technical than personal. Therefore, you shouldn't only consider this. Our goal is to help you, but what's important to us may not be important to you. You decide which one is the best! Comment!

3 Advantages Xiaomi Mi Mix 3 (128GB/6GB)	vs	26 Advantages Samsung Galaxy S21 FE (SM-G990U 128GB)
+128GB (110GB available)13% More internal storage for applications and files	vs	128GB (97GB available)
+Aluminum body, glass front, ceramic backAdvantage More resistant material	vs	Aluminum body, glass front, plastic back
+LED flash on both camerasAdvantage The LED flash on both cameras helps in dark places or in low light	vs	LED flash
2.8GHz 64bit Octa-core (10nm)	vs	+2.84GHz 64bit Octa-core (5nm)6% More powerful processor, you can open your applications faster
6GB LPDDR4X	vs	+6GB LPDDR5Advantage This RAM type is better and more efficient.
UFS 2.1	vs	+UFS 3.1Advantage Fastest write and read storage.
218 grams (7.63 ounces)	vs	+177 grams (6.2 ounces)23% Lighter
8.5 millimeters (0.33 inches)	vs	+7.9 millimeters (0.31 inches)8% Thinner
HDR8	vs	+HDR10+Advantage The HDR10+ display provides vibrant colors and more details
60Hz	vs	+120Hz100% The display reproduces more frames per second because the frequency (Hertz) is higher, improves fluidity and tires your eyes less.
1080x2340 pixels	vs	+1080x2400 pixels3% Higher resolution screen
403 PPI	vs	+411 PPI2% Crisper display of text, images and videos because it has more pixels per inch (ppi)
6.39"	vs	+6.4"1% Larger screen
(dual camera) 12MP + 12MP	vs	+(triple camera) 12.2MP + 12MP + 8MP34% Higher resolution main camera
1/2.55" inches	vs	+1/1.76" inches45% The larger sensor camera lets you take photos with better depth.
(dual front camera) 24MP + 2MP	vs	+(front) 32MP23% Higher resolution secondary camera to take pictures and selfies
(front) Full HD (1920x1080)	vs	+(front) 4K UHD (3840x2160)3 times More image quality for recording videos with the secondary camera
Android 10	vs	+Android 15Advantage Android 15 is newer and safer
4G LTE-A	vs	+5G SA/NSAAdvantage The 5G SA/NSA network is newer and faster
(4G LTE-A) 600 Mbps	vs	+(5G SA/NSA) 2000 Mbps2 times Faster for surfing the internet and download files
Not supported	vs	+BarometerAdvantage Sensors help you use the device
Virtual proximity sensor	vs	+Proximity sensorAdvantage Sensors help you use the device
3200 mAh	vs	+4500 mAh41% Battery - higher amperage (mAh) allows more device usage time, but it also depends on the hardware and use
18W	vs	+25W39% More power (watts) to charge the battery faster. Sometimes, the charger that comes with the device doesn't have the same power supported by the device. Check before you buy it.
Mono sound (not stereo)	vs	+Stereo soundAdvantage Better sound quality for listening to music or clearer hands-free calls
802.11 a/b/g/n/ac [wifi5]	vs	+802.11 a/b/g/n/ac/ax [wifi6]Advantage WiFi 802.11 a/b/g/n/ac/ax [wifi6] is newer and faster
Not supported	vs	+DLNAAdvantage With DLNA technology you can access and play media files on TV, tablet or DLNA compatible device.
USB 2.0 Type-C, USB OTG On-The-Go	vs	+USB 3.2 Type-C, USB OTG On-The-GoAdvantage Newer and faster USB version for transferring photos, mp3 or data.
Not supported	vs	+IP68 certifiedAdvantage Protection against water allows you talk to your friends in the rain, for example

30 Common items in both devices

Super AMOLED / Dynamic AMOLED

16 million

Digital and optical zoom

PDAF: phase detection autofocus

OIS (4-axis): Optical stabilization / OIS: Optical stabilization

BSI sensor

HDR photo on both cameras / HDR photo/video on both cameras

+23 specs and more in the table below

Check the comparison table below for more items that are not evaluated in comparison score above.

Highlight differences

📱 Model features
	Xiaomi Mi Mix 3 (128GB/6GB)	Galaxy S21 FE (SM-G990U 128GB)
Change model		Choose the model
Model	Xiaomi Mi Mix 3 (128GB/6GB)	Galaxy S21 FE (SM-G990U 128GB)
Other model names	小米MIX 3, Xiaomi Mix 3 M1810E5A	Galaxy S21 FE 5G SM-G990U1 (Snapdragon)
Country or region available	(Global, International), China	USA
Brand	Xiaomi	Samsung
Release date	11/1/2018, Announced: 10/1/2018	1/7/2022, Announced: 1/4/2022
Depth	8.5 millimeters (0.33 inches)	7.9 millimeters (0.31 inches)
Size (width x height)	74.69 x 157.89 millimeters (2.94 x 6.22 in)	74.5 x 155.7 millimeters (2.93 x 6.13 in)
Weight	218 grams (7.63 ounces)	177 grams (6.2 ounces)
Build, materials	Aluminum body, glass front, ceramic back	Aluminum body, glass front, plastic back
Protection against water and others	Not supported	IP68 certified: water-resistant up to 1.5 meters for 30min and dust-resistant
📲 Display
	Xiaomi Mi Mix 3 (128GB/6GB)	Galaxy S21 FE (SM-G990U 128GB)
Display type	Super AMOLED	Dynamic AMOLED
Screen size	6.39" inches	6.4" inches
Screen-to-body ratio	~85% (screen-to-body ratio)	~85.3% (screen-to-body ratio)
Display resolution	1080x2340 pixels (19.5:9)	1080x2400 pixels (20:9)
Touchscreen	Capacitive Multitouch	Capacitive Multitouch 10-points
Pixel density (dot pitch)	403 PPI	411 PPI
Colors	16 million	16 million
Scratch-resistant glass	Gorilla Glass 3	Gorilla Glass Victus
Refresh rate	60Hz	120Hz
Display features	600nits[typ] HDR8	1300nits[peak] HDR10+ Always-On Display
🤖 Operating System
	Xiaomi Mi Mix 3 (128GB/6GB)	Galaxy S21 FE (SM-G990U 128GB)
System version	Android 9.0 Pie	Android 12
Firmware update	Android 10	Android 15
User Interface	MIUI 10 / 12	One UI 4.1 / 5.1 / 6.0 / 7.0
⚙️ Processor
	Xiaomi Mi Mix 3 (128GB/6GB)	Galaxy S21 FE (SM-G990U 128GB)
Chipset	64bit: Qualcomm Snapdragon 845 (SDM845) (10nm)	64bit: Qualcomm Snapdragon 888 (SM8350) (5nm)
CPU	Octa-core, 2 processors: 4x 2.8GHz Kryo 385 Gold (Quad-core) 4x 1.7GHz Kryo 385 Silver (Quad-core)	Octa-core, 3 processors: 1x 2.84GHz Kryo 680 (Single-core) 3x 2.42GHz Kryo 680 (Triple-core) 4x 1.8GHz Kryo 680 (Quad-core)
GPU graphical controller	Qualcomm Adreno 630 (710MHz)	Qualcomm Adreno 660 (840MHz)
Performance (benchmark)	AnTuTu: 292353 (v7), 352130 (v8) Geekbench: 9065 (v4.4), 2170 (v5.1) GFXBench: 30fps (ES 3.1 onscreen)	AnTuTu: 566529 (v8), 719696 (v9) Geekbench: 3049 (v5.1) GFXBench: 56fps (ES 3.1 onscreen)
💽 Memory and storage
	Xiaomi Mi Mix 3 (128GB/6GB)	Galaxy S21 FE (SM-G990U 128GB)
RAM memory	6GB LPDDR4X	6GB LPDDR5
Internal storage	128GB (110GB available) UFS 2.1	128GB (97GB available) UFS 3.1
External storage	Not supported	Not supported
📶 Mobile networks
	Xiaomi Mi Mix 3 (128GB/6GB)	Galaxy S21 FE (SM-G990U 128GB)
Dual-SIM	Dual-SIM Standby - Call active on one sim card	Dual-SIM Standby - Call active on one sim card
SIM card	2 slots (Dual-SIM) nano-SIM (4FF)	2 slots (Dual-SIM) nano-SIM (4FF)
Maximum Download / Upload	600/50 Mbps	2000/1024 Mbps
Network technology	2G, 3G, 4G	2G, 3G, 4G, 5G
Frequency, bands	Expand band details Collapse details
GSM MHz band	Quad-Band 850/900/1800/1900	Quad-Band 850/900/1800/1900
Primary 2G network	CDMA 800/1900, GSM 850/900/1800/1900	GSM 850/900/1800/1900
Primary 3G network	Global version: UMTS 800/850/900/1700/1800/1900/2100 China version: CDMA2000 1xEV-DO TD-SCDMA 1900/2000 UMTS 850/900/1700/1900/2100	UMTS 850/900/1700/1900/2100
Primary 4G network	LTE Cat11 VoLTE Global version: LTE (1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 29, 30, 66) TD-LTE (34, 38, 39, 40, 41) China version: LTE (1, 2, 3, 4, 5, 7, 8, 12, 17, 20) TD-LTE (34, 38, 39, 40, 41)	LTE Cat20 (1, 3, 3, 4, 5, 7, 8, 12, 20, 28) TD-LTE (34, 38, 39, 40, 41) VoLTE
Primary 5G network	Not supported	SA/NSA/Sub6 (1, 3, 5, 8, 28, 41, 78, 79)
Primary data network	GPRS, EDGE, CDMA2000 EV-DO Rev 0, CDMA2000 EV-DO Rev A, TD-SCDMA, UMTS, TD-HSDPA, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A	GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA
Secondary 2G network	GSM 850/900/1800/1900	GSM 850/900/1800/1900
Secondary 3G network	Global version: UMTS 800/850/900/1700/1800/1900/2100 China version: UMTS 850/900/1700/1900/2100	UMTS 850/900/1700/1900/2100
Secondary 4G network	LTE Cat11 VoLTE Global version: LTE (1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 29, 30, 66) TD-LTE (34, 38, 39, 40, 41) China version: LTE (1, 2, 3, 4, 5, 7, 8, 12, 17, 20) TD-LTE (34, 38, 39, 40, 41)	LTE Cat20 (1, 3, 3, 4, 5, 7, 8, 12, 20, 28) TD-LTE (34, 38, 39, 40, 41) VoLTE
Secondary data network	GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A	GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA
📷 Camera
	Xiaomi Mi Mix 3 (128GB/6GB)	Galaxy S21 FE (SM-G990U 128GB)
Back camera (main camera)	(dual camera) 12 megapixels 12MP telephoto 1/3.4"1.0µm	(triple camera) 12.2 megapixels 12MP ultrawide f/2.2123°13mm1/3"1.12µm 8MP telephoto f/2.476mm1/4.5"1.0µmPDAFOIS3x-optical-zoom
Main camera resolution	4000x3000 pixels	4032x3024 pixels
Video recording (primary)	4K UHD (3840x2160) 60 fps	4K UHD (3840x2160) 60 fps
Flash	LED flash on both cameras	LED flash
Focal aperture	f/1.8 (aperture)	f/1.8 (aperture)
Focal length	feature not registered	26mm (lens)
Sensor size	1/2.55" inches	1/1.76" inches
Pixel size	1.4µm pixel	1.8µm pixel
Autofocus	PDAF: phase detection autofocus	PDAF: phase detection autofocus
Touch focus	Supported	Supported
Image stabilization	OIS (4-axis): Optical stabilization	OIS: Optical stabilization
Zoom	Digital and optical zoom	Digital and optical zoom
Face/smile detection	Face detection, Smile detection	Face detection, Smile detection
BSI sensor	Supported	Supported
HDR	HDR photo on both cameras	HDR photo/video on both cameras
Camera extras	4K@30/60fps 1080p@30/60/960fps	4K@30/60fps 1080p@30/60fps 1080p@240fps (slow motion) 720p@960fps (slow motion)
📸 Front camera
	Xiaomi Mi Mix 3 (128GB/6GB)	Galaxy S21 FE (SM-G990U 128GB)
Front camera (secondary)	(dual front camera) 24 megapixels 2MP depth	32 megapixels
Front camera resolution	5656x4224 pixels	6528x4896 pixels
Video recording (secondary)	Full HD (1920x1080)	4K UHD (3840x2160)
Front flash	LED	Not supported
Focal aperture	f/2.0 (aperture)	f/2.2 (aperture)
Focal length	26mm (lens)	26mm (lens)
Sensor size	1/2.8" inches	1/2.74" inches
Pixel size	0.9µm pixel	0.8µm pixel
🔉 Sound and multimedia
	Xiaomi Mi Mix 3 (128GB/6GB)	Galaxy S21 FE (SM-G990U 128GB)
Loudspeaker	Mono sound (not stereo)	Stereo sound 32-bit/384kHz Dolby Atmos Tuned by AKG
Active noise cancellation	2 microphones or more	2 microphones
Radio	Not supported	Not supported
TV	Not supported	Not supported
Video formats	MP4, H.265, H.264, H.263, XviD, MKV	MP4, H.265, H.264, H.263, XviD, MKV
Audio formats	MP3, WAV, WMA, eAAC+, FLAC	MP3, WAV, WMA, eAAC+, FLAC
🔌 Connectivity
	Xiaomi Mi Mix 3 (128GB/6GB)	Galaxy S21 FE (SM-G990U 128GB)
USB	USB 2.0 Type-C, USB OTG On-The-Go	USB 3.2 Type-C, USB OTG On-The-Go
Audio output	Type-C jack with 3.5mm jack adapter	Type-C reversible connector
TV output	USB Type-C (reversible)	USB Type-C SlimPort®
Bluetooth	5.0 + A2DP/LE	5.0 + A2DP/LE
WiFi	802.11 a/b/g/n/ac [wifi5] (2.4GHz, 5GHz) + MIMO WiFi Direct, hotspot	802.11 a/b/g/n/ac/ax [wifi6] (2.4GHz, 5GHz) + MIMO WiFi Direct, hotspot
DLNA	Not supported	Supported
GPS	A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou, QZSS	A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou
NFC	Supported	Supported
Infrared port	Not supported	Not supported
🧭 Sensors
	Xiaomi Mi Mix 3 (128GB/6GB)	Galaxy S21 FE (SM-G990U 128GB)
Sensors	Accelerometer Ambient light sensor Compass Face unlock 2D Fingerprint sensor (rear-mounted) Gyroscope Virtual proximity sensor	Accelerometer Ambient light sensor Barometer Compass Face unlock 2D Fingerprint sensor (under display) Gyroscope Hall effect Proximity sensor
Vibrating alert	Supported	Supported
🔋 Battery
	Xiaomi Mi Mix 3 (128GB/6GB)	Galaxy S21 FE (SM-G990U 128GB)
Battery type	Li-Ion: lithium-ion (Non removable)	LiPo: li-ion polymer (Non removable)
Battery capacity	3200 mAh	4500 mAh
Charger, watts	18W Wired fast charging Quick Charge 4	25W Wired fast charging Reverse charging by cable USB Power Delivery 3.0
Inductive / wireless charging	10W Qi wireless charging	15W Qi wireless charging 4.5W Reverse wireless charging
Talk time autonomy	feature not registered	feature not registered
Standby	feature not registered	feature not registered
➕ Other features
	Xiaomi Mi Mix 3 (128GB/6GB)	Galaxy S21 FE (SM-G990U 128GB)
Call control	Voice dialing, Voice recorder	Voice dialing, Voice recorder, Voice commands
Messaging	SMS (T9), MMS, E-mail, Push mail	SMS (T9), MMS, E-mail, Push mail
Hands-free calling	Supported	Supported
Video calling	Supported	Supported
Ringtones	Polyphonic and customized	Polyphonic and customized
Web browser	HTML, XHTML, HTML5	HTML, XHTML, HTML5
Antenna	Internal antenna	Internal antenna
Qwerty physical keyboard	Not supported	Not supported
Miscellaneous	• Colors: Onyx Black, Jade Green, Sapphire Blue • Mechanical pop-up front camera	• Colors: Graphite, White, Lavender, Olive
☢️ Radiation rate
	Xiaomi Mi Mix 3 (128GB/6GB)	Galaxy S21 FE (SM-G990U 128GB)
SAR 1.6W/kg (USA, Mexico, etc.)	1.45W/kg (head), 1.57W/kg (body)	0.77W/kg (head), 0.9W/kg (body)
SAR 2W/kg (Europe, UK, etc.)	feature not registered	feature not registered